Across
- 3. meteor that reaches the atmosphere of earth
- 7. spinning on its axis
- 11. day and night are almost the same length
- 12. path in a circular motion
- 13. pattern of stars in the sky
- 14. can be inhabited
- 15. a group of billions of stars
- 17. force that pulls us down to earth
- 18. longest and shortest days of the year
Down
- 1. orbit around the sun
- 2. the sun and everything that orbits it
- 4. imaginary line that divides the earth
- 5. snowballs of frozen gases, rock and dust
- 6. small rocky objects orbiting the sun
- 8. study of space
- 9. one of two halves of the earth
- 10. used to express distance in space
- 13. pertaining to bodies or objects in space
- 16. all of space including galaxies